Burnishing Tools Aim To Reduce Machining Time

Using customized rollers that cold work a metal surface, the Superoll burnishing tools can burnish the inside or outside diameters of any bored, reamed or turned workpiece to produce a fine, wear-resistant finish (to 2 microinches or less) in one pass. According to the company, what results is a mirror-like, smooth, hard surface with better resistance to corrosion than a ground or honed workpiece.

These tools are typically used in burnishing connecting rod bearing surfaces, cylinders, piston housings, shafts, connecting rods and pins, valves and valve seat surfaces, in the semiconductor industry, and in any mating surfaces.

Unlike the metal removal process of grinding, honing, lapping and other finishing methods that cut to remove rough machining markings on a part, the tool uses a plastic deformation-process to cold work the rough metal into a smooth surface that is virtually free from irregularities.

The burnishing tools can reduce a 100 to 125 microinch machined surface of a workpiece to a 2 to 15 microinch finish in one pass.  A single pass with a Superoll tool will finish some rough machined surfaces to 0.7 microinch, with an average of a 5 to10 percent increase in surface hardness within a depth penetration of 0.01" to 0.03" below the burnished surface.

The tools are available in standard designs to burnish workpieces with 0.176" to 7.917" IDs and ODs from 0.97" to 2.477".

These tools are available for burnishing internal and external diameters of a machined part, for tapered and stepped surfaces, contours, fillets and flat faces, bearing bores and for special applications.

They are also available for simultaneously burnishing the inside and outside diameters of machined parts with an OD as small as 0.82" and up to 3.75". The ID can range from 0.184" to 6.50".



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